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Characterization of a novel EPID designed for simultaneous imaging and dose verification in radiotherapy
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10.1118/1.4816657
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    Affiliations:
    1 Institute of Medical Physics, School of Physics, University of Sydney, Sydney, NSW 2006, Australia and Ingham Institute for Applied Medical Research, Sydney, NSW 2170, Australia
    2 Department of Medical Physics, Liverpool and Macarthur Cancer Therapy Centres, NSW 2170, Australia; Ingham Institute for Applied Medical Research, Sydney, NSW 2170, Australia; and Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW 2522, Australia
    3 Department of Medical Physics, Liverpool and Macarthur Cancer Therapy Centres, NSW 2170, Australia; Institute of Medical Physics, School of Physics, University of Sydney, Sydney, NSW 2006, Australia; Ingham Institute for Applied Medical Research, Sydney, NSW 2170, Australia; Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW 2522, Australia; and South Western Sydney Clinical School, University of New South Wales, Sydney, NSW 2170, Australia
    4 Department of Radiation Oncology, Calvary Mater Newcastle Hospital, Newcastle, NSW 2298, Australia and School of Mathematical and Physical Sciences, University of Newcastle, Newcastle, NSW 2308, Australia
    5 Institute of Medical Physics, School of Physics, University of Sydney, Sydney, NSW 2006, Australia
    6 Department of Medical Physics, Liverpool and Macarthur Cancer Therapy Centres, NSW 2170, Australia; Institute of Medical Physics, School of Physics, University of Sydney, Sydney, NSW 2006, Australia; and Ingham Institute for Applied Medical Research, Sydney, NSW 2170, Australia
    a) Author to whom correspondence should be addressed. Electronic mail: philip.vial@sswahs.nsw.gov.au
    Med. Phys. 40, 091902 (2013); http://dx.doi.org/10.1118/1.4816657
/content/aapm/journal/medphys/40/9/10.1118/1.4816657
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/9/10.1118/1.4816657

Figures

Image of FIG. 1.
FIG. 1.

Schematic illustration of the main components of (a) the standard clinical EPID incorporating a metal plate/phosphor screen and (b) the prototype experimental EPID incorporating a segmented plastic scintillator array. The same -Si photodiode array was employed in both configurations. Schematics are not drawn to scale and the gaps located between neighboring layers are for illustrative purposes only.

Image of FIG. 2.
FIG. 2.

(a) Photograph of the segmented plastic scintillator array used in the experimental EPID. The segmented structure is clearly visible in the magnified view (b). Each segment has a cross-sectional area measuring 1 × 1 mm, is 15 mm long, and is surrounded by an optically reflective coating.

Image of FIG. 3.
FIG. 3.

Pixel values per MU measured at the center of the standard and experimental EPIDs for beam deliveries ranging from 1 to 100 MU. Values have been normalized to that measured with a beam delivery of 100 MU.

Image of FIG. 4.
FIG. 4.

Comparison of (a) nontransit and (b) transit off-axis ratios measured using the MatriXX detector (ion chamber), the standard EPID, and the experimental EPID.

Image of FIG. 5.
FIG. 5.

Comparison of (a) nontransit and (b) transit field size output factors measured using a MatriXX ionization chamber array, the standard EPID, and the experimental EPID.

Image of FIG. 6.
FIG. 6.

Comparison of transmission factors measured using a MatriXX ionization chamber array, the EPID in its standard configuration, and the experimental EPID with the segmented plastic scintillator.

Image of FIG. 7.
FIG. 7.

High dose (50 frame-averaged) images of the QC-3V image quality phantom (with dark and flood field corrections applied) taken with (a) the standard EPID and (b) the experimental EPID.

Image of FIG. 8.
FIG. 8.

Anterior-posterior projection images of the anthropomorphic head phantom (with dark and flood field corrections applied) taken with (a) the standard EPID and (b) the experimental EPID.

Tables

Generic image for table
TABLE I.

Quantitative comparison of the CNR and spatial resolution of the standard and experimental EPID configurations.

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/content/aapm/journal/medphys/40/9/10.1118/1.4816657
2013-08-05
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Characterization of a novel EPID designed for simultaneous imaging and dose verification in radiotherapy
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/9/10.1118/1.4816657
10.1118/1.4816657
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